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公开(公告)号：US2637242A
公开(公告)日：1953-05-05
申请号：US7511249
申请日：1949-02-08
Applicant: AMERICAN OPTICAL CORP
Inventor： HAROLD OSTERBERG , MULLER ROBERT M , LUNEBURG RUDOLF K
IPC: G03B21/20
CPC classification number: G03B21/208
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